Proportional spacer



M. E. CONCANNON.

PROPORTIONAL SPACER.

APPLICATION FILED Nov. I5, |919.

1,35 1 88 9 Patented Sept. 7, 1920.

UNITED ASTATI-1s PAT-ENT OFFICE.

IPROPORTIONAL SPACER.

Specification of Letters Patent.

Patented Sept. 7, 1920.

Application mea November 15, 1919. Serin No. 338,216.

To all 'whom t may concern: n

Be it known that I, MICHAEL E.' CoNoAN- NoN, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements inProportional Spacers, offwhieh the following is a specification. 1 i

One of the objects of the invention is t0 provide an` instrument thatwill 'automatically divide the distance betweentwoobjective points intoa'V plurality of subdivisions of uniform extent.

Another object is to provide an instrument which will automaticallydivide the distance between two objective points into av plurality ofparallel lines and subdivide each line, the divisional points being ofsubstantially uniform extent and inistaggered relation.

Another object is to provide an instrument having a plurality of'designating points `'provided with perforated pivoted connections withinwhich to insert a prick punch, or the like,tomark the points ofsubdivision.

Another-objectis to utilize a pantograph structure comprising a seriesof hinged together strips or blades, to provide a series ofparallelograms -in which the pivoted joints are hollow, through which toindicate the spaced apart points. A

Other, further and more specific objects of the invention will becomereadily apparent, to persons skilled in the art, from a consideration ofthe following description when taken in conjunction with the drawings,wherein- Figure 1 is a top plan viewV of a device made in accordancewith the invention.

Fig. 2 is a similar view enlarged and showing parts broken away.

Fig. 3 isa side elevation of Fig. 2.

Fig. 4 is atransver'se section, taken on line 4--4 of Fig.'3. y v

Fig. 5 is a similar view, taken on line 5-5 of Fig. 2.

In all the views the same reference characters .are employed to indicatesimilar arts. v

In the drawings an embodiment of the inl vention'is shown in whichtwo-bars 10 and 11 are axially slidable with respect to each other. Thebar y10 is provided in its upper surface with ya dove-tail vslot 12, thebar 11 having a corresponding tenon slidable in the slot. The bar 10 isprovided with a series .of spaced apart perforations 13, through .theperforations 17, so thatv when the head.

16V is rotated one-fourth of a revolution the bolt 14 may be placed inthe transverse perforation, orin any one of the perforations that are inline with the perforations 13 in the bar 10. vBy this means the barsmaybe accurately adjusted with respect to each other, as to the degree towhich the outer ends of the bars may be separated. Secured to each endof the bars 10 and 11 are heads 18 and 19, respectively. The heads 18and 19 are substantial duiplicates with the exception that the portion20 of the head v19 is raised somewhat above the level ofthe portion 21of the head 18, so that the bar 11 may slide freely over and above thebar 10 and to provide an opening 42 through which the bar 10 may slide,so that the bottomvportions 22 and 23, respectively, may

be of the same length. Each of the heads is provided with an elongatedvertical slot 24 and aparallel plate 25 separated by spacing washers 26.A series of straps or plates 27 and 28 are pivoted together at theirAends and at Acentral intermediate points to formav-series ofparallelograms constituting a substantial pantograph structure. A hollow:threaded bolt 29, having an axial opening 30, and a head on one end andscrew threaded shank on the other end, passes through contiguous ends or@parts of the blades or straps 27 and 28. The terminal ends, 32 and 33of the pantographic structure, are secured in the heads 22 and 23,respectively, by nuts 34 and other similar nuts, threaded on the bolts29, which secure the straps t0- gether but permit free pivotal movementthereof. The other ends 35 and 36 of the pantographic structurev arevertically movable in the slots 24.

Now it is manifest that Vwhen the panto graphic structure is'eXtendedthe adjacent terminal 'pivotal points 35 and 36 will be furtherextended, as will also the intermediate pivotal points 37 and 38. Whenthe heads 22 and 23 are brought closer together, the distance betweenthe heads will be automatically divided by the pantographic structureinto as vmany points as there are pivots between the bars or blades 27and 28 andwhen the structure is moved to extended or contracted positionthe terminal ends 35 and 36 will move vertically in the slots 24.

The scale or index al-O and 111, on the respective bars 10 and 11,indicate the distance of separation of the heads 22 and 23 and 'afterthe heads Vhave been separated the elongated head 16, of the bolt 15,may be kber `of holes in a given line desired.

rotated until one of the holes 17 is brought into register with theholes 13, to produce fractional adjustment, whereupon the bolt 141 isinserted in the registering holes and fthe two bars 10 and 11 are thusheld in separated position. Y In laying out the rivet holes on boilersheets, the structure is very advantageous as in such instances theholes are frequently to be made in staggered relation. Vilhen the totaldistance of separation is given the number 'ofdivisional points in aline will equal the number `of rectangular structures included betweenthe heads.

On a boiler sheet of a given length, in which a given number ofperforations or holesA areto vbe' made to receive the rivets, it is theusual custom to divide the distance by' use of aV pair of dividers, orotherwise,

and to indicate the divisional points with a tance .to be perforated, isdeterminedV by the distance of separation of the heads23 and 2st,andafter `theyhave been separated accordingly the perforated pivots willindicate theY distanceof separation of adjacent holes, provided thecorresponding number of rectangular structures have been placedbetweenthe heads for determining the nriiflie upper line, in which theterminals 35 and 36 are located, is parallel with the intermediatelinein which the pivotal points 37 Vare locatedand they are Valsoparallel with Vthe lower line so that the holes, or prick punch markswill appear in the boiler sheet in staggered relation. All three of thelines may be used or any one or two, as desired and of course it ismanifest that any number of bars 27 and 28 of suitable length may be.ing the heads in fixed relation.

included between the heads 22 and 23, depending upon the number of holesto be made in the sheets.

TWhen the distance of separation between the heads 22 and 23 is to berelatively short the bar 11 may be removed and the bar 10 only, used, inwhich event it would slide through the perforation 412 made in the part20- of the head 19, and the structure 16, shown at the right of thishead, Amay be employed instead of the structure 16, shown intermediatethe heads for the purpose of hold- A ller block may be placedin theperforation .A12 when the perforation is not in use.

The pointer 4i, on the bar 10, cooperatel with the scale or graduateddivision 47, to indicate the distance of separation between the heads.

^ After the heads have been separated and fixed in the holes 30 and bystriking the punch on the end, in the usual manner points will be madein the sheet for producing such indications. When the instrument israised from the plate, the points for the holes will be probablyindicated a uniform distance apart and when necessary in staggeredrelation.

Vhile a single embodiment of the invention has been shown for cleardisclosure, it will be manifest to persons skilled in the art that manychanges may-be made in the general configuration, disposition of theparts within the scope of the appended claims.

Having described my invention, what l claim is:

1. An instrument of the character .described having in combinationtwobars overlapping and slidable longitudinally of each other; a head onone endlof each bar; a pantograph structure vhaving its terminal endsconnected to the respective heads, and a punch guide carried by thepivoted joints of the pantograph structure.

j 2. An instrument' of the character described having in combination twobars overlapping and slidable longitudinally of each other; a head ononeend of Veach bar; a pantograph structure having its terminal 'endsconnected to the respective heads; a

punch guide carried by the pivoted joints 'of theipantograph structureand adjustable tograph structure having its terminal ends connected tothe respective heads and having perforated pivots connecting its partsthereof together through which a punch may be passed and adjustablemeans for separating heads and for securing the bars together.

4. An instrument of the Character described havingin combination twobars overlapping and slidable longitudinally of each other; a head,having a slot, on one end of 5 each bar; a pantograph structure havingone of its terminal ends pivoted to each of the heads and its other endslidable in the respeotive slots; means to secure the bars togather inadjusted position and a punch guide carried by pivoted joints of thepantograph structure.

In testimony whereof I hereunto subscribe my name.

MICHAEL E. CONCANNON.

